Animals that start with the letter D
Words of Encouragement
Triple Rhyme Time
Backpacking
The Laws of Physics
200

dog

200

Add a letter to "raise" to get this, sure to raise your spirit

praise

200

An extra trap for a rabbit relative

spare hare snare

200

"The Hitchhiker's Guide to the Galaxy" says to carry one of these everywhere to dry you

a towel

200

The lightweight plastic rocket flies far above the drop point, while the more massive launcher barely bounces-- a textbook example of this man's second & third laws of motion

[Isaac] Newton

400

deer

400

A helpful act, or a shove that lifts you from below

a boost

400

[DD]

The highest limit on a pants tariff

max slacks tax

400

Be sure to have a waterproof container for your bedroll, AKA this 2-word portable bed

a sleeping bad

400

P stands for pressure & V for this in the ideal gas law, PV = nRT

Volume

600

dodo

600

This 4-word phrase can refer to a vaccination or, metaphorically, a stimulus

a shot in the arm

600

a frightening sprite from the flatlands of Kansas or Nebraska

 scary prairie fairy

600

Depending on your size & planned exertion, figure 1.5-2.5 pounds of food or 2500-4500 of these units per person per day

calories

600

To double the stretch of a spring, you have to double the strength of the pull per "Hooke's Law of " this property

elasticity

800

dingo

800

a type of iron, or to fill oneself with determination

steel

800

The cost to ship a really big wooden box, determined by how heavy it is

crate freight rate

800

[DD]

You can save space in the pack by using a multi-tool, like this one named for a national military branch

Swiss army knife
800

The First Law of Thermodynamics is AKA the principle of conservation of this 

Energy

1000

dragon eel

1000

This item seen below; as a verb, it can mean to help lift someone's spirits

buoy

1000

The removed facial hair, now hallowed

sheer beard revered

1000

This company named for a region of Argentina sells lightweight black hole bads

Patagonia

1000

Snell's Law, or the law of refraction, is a major law of this branch of physics

optics